1. An electron has a ______________________ charge.
2. A proton has a _________________ charge.
3. An atom gains a net charge by _______________ _____________________.
4. _______________ do not move from an atom.
5. If _______________ leave an atom, the atom changes into _________ ____________.
6. To gain a net positive charge, an atom must _____________ _____________.
7. To gain a net negative charge, an atom must ______________ _________________.
8. The units for measuring charge are _______________.
9. 1.602 x 10­19 C = 1 ________________________.
10. 1.602 x 10­19 C is referred to as the _________________________ charge because no single whole object can have any less than it.
11. Copper is a good conductor because it __________________ holds its electrons.
12. Styrofoam is a good insulator because it ________________ holds its electrons.
13. The leaves on an electroscope separate from each other when charged because they both have ________________ charge.
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14. A metal sphere with a charge of +5e has lost/gained __________________ electrons.
15. Matt has a net charge of ­5000e. He has lost/gained ___________________ electrons.
16. If two balloons with like charges are brought near each other, they will ________________.
17. You get zapped by the Van de Graff generator because you have the ______________ ___________________of the generator.
18. A _________________ allows charge to pass through it easily.
19. A _________________ does not allow charge to pass through it easily.
20. You get zapped when touching a door knob because the knob has the _____________ ____________ of you.
21. A nickel has gained 3 excess electrons. Find the charge in Coulombs on the nickel.
22. Two balloons are each given a charge of +7e.
a. Find the net charge in Coulombs for each balloon.
b. The balloons get a string attached to each. Each of the strings are then attached to a common point. What will the balloons do? Draw a picture of what it will look like.
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23. The study of charges at rest is called _______________________.
24. Lightning is an example of _________________________.
25. Draw a diagram of the leaves on an electroscope for when it has a net positive charge.
26. Why are small pieces of paper attracted to a charged plastic rod?
q1
q2
d(m)
+2C
+2C
0.5
­3C
0.1
­3C
­1C
1C
2
1 x 10­3 C
2 x 10­3 C
0.5
­4 x 10­3 C
­3 x 10­3 C
0.75
6 x10­6 C
­4 x10­6 C
0.002
3 x 105 C
7 x105 C
2.5
450 C
­25C
5.2
67 C
­67C
6.8
­4C
2C
0.7
Force(N)
Attractive or Repulsive
3